VB-DirectX, Modify vertex data during rendering

Modify vertex data during rendering

Author	Message
Zach McCai #1 / 5	Modify vertex data during rendering Hi all, I'm afraid the answer to this is terribly simple but reading the sdk and scanning mboards has not driven the light into my skull yet. I have a basic program which reads in a POV raw triangle file and puts the data into a DXvertexBuffer for rendering as a triangle list with my D3DDevice. Problem is , I want to modify the color of the vertices without having to basically reinitialize the whole process. Reading the documentation the only clue I saw was the D3DVertexBuffer8SetData function, but if I read that correctly it is actually 3 functions and would have to be called for each element in the buffer (which I'm not even going to contemplate unless a guru whacks me with an idiot stick). Any help would be greatly appreciated! Thanks, Zach McCain (my first dx program, be gentle)
Tue, 22 Feb 2005 10:58:52 GMT

Zach McCai #2 / 5	Modify vertex data during rendering BTW: DX8.1
Tue, 22 Feb 2005 23:14:06 GMT

Philip Taylor [MS #3 / 5	Modify vertex data during rendering lock the vb, get the memory pointer. then walk the memory, and modify the data. then unlock the vb. then you can use it to submit a DrawPrim request. -- Phil Taylor PM : DirectX SDK, Managed DirectX, Windows XP Inbox 3D screensavers, and a few more bits and bobs. http://msdn.microsoft.com/directx This posting is provided "AS IS" with no warranties, and confers no rights. Quote: > Hi all, > I'm afraid the answer to this is terribly simple but > reading the sdk and scanning mboards has not driven the > light into my skull yet. I have a basic program which > reads in a POV raw triangle file and puts the data into a > DXvertexBuffer for rendering as a triangle list with my > D3DDevice. > Problem is , I want to modify the color of the vertices > without having to basically reinitialize the whole process. > Reading the documentation the only clue I saw was the > D3DVertexBuffer8SetData function, but if I read that > correctly it is actually 3 functions and would have to be > called for each element in the buffer (which I'm not even > going to contemplate unless a guru whacks me with an idiot > stick). > Any help would be greatly appreciated! > Thanks, > Zach McCain (my first dx program, be gentle)
Fri, 04 Mar 2005 09:23:56 GMT

Nerseu #4 / 5	Modify vertex data during rendering Are you creating the VertexBuffer yourself filling it with your own custom vertices? If you only need to set the values once, you can specify a vertex format that includes diffuse color, then set the values in your vertices before saving them to the VertexBuffer. If you do it after the fact, you'll have to use Philip's method of locking the buffer, etc. -nerseus Quote: > Hi all, > I'm afraid the answer to this is terribly simple but > reading the sdk and scanning mboards has not driven the > light into my skull yet. I have a basic program which > reads in a POV raw triangle file and puts the data into a > DXvertexBuffer for rendering as a triangle list with my > D3DDevice. > Problem is , I want to modify the color of the vertices > without having to basically reinitialize the whole process. > Reading the documentation the only clue I saw was the > D3DVertexBuffer8SetData function, but if I read that > correctly it is actually 3 functions and would have to be > called for each element in the buffer (which I'm not even > going to contemplate unless a guru whacks me with an idiot > stick). > Any help would be greatly appreciated! > Thanks, > Zach McCain (my first dx program, be gentle)
Sun, 26 Jun 2005 05:08:35 GMT

Nerseu #5 / 5	Modify vertex data during rendering Whoops - I sorted my newsgroup on "From" instead of date. Sorry to answer such an old post :) -Nerseus Quote: > Are you creating the VertexBuffer yourself filling it with your own custom > vertices? > If you only need to set the values once, you can specify a vertex format > that includes diffuse color, then set the values in your vertices before > saving them to the VertexBuffer. > If you do it after the fact, you'll have to use Philip's method of locking > the buffer, etc. > -nerseus > > Hi all, > > I'm afraid the answer to this is terribly simple but > > reading the sdk and scanning mboards has not driven the > > light into my skull yet. I have a basic program which > > reads in a POV raw triangle file and puts the data into a > > DXvertexBuffer for rendering as a triangle list with my > > D3DDevice. > > Problem is , I want to modify the color of the vertices > > without having to basically reinitialize the whole process. > > Reading the documentation the only clue I saw was the > > D3DVertexBuffer8SetData function, but if I read that > > correctly it is actually 3 functions and would have to be > > called for each element in the buffer (which I'm not even > > going to contemplate unless a guru whacks me with an idiot > > stick). > > Any help would be greatly appreciated! > > Thanks, > > Zach McCain (my first dx program, be gentle)
Sun, 26 Jun 2005 05:38:36 GMT

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